Chances are the "shiny steel looking" 30-06 Winchester is probably a brass case with a nickel coating - is a thing with some people that they prefer that type. But as kamlooky posted - more of same kind of head stamp is better.
Is a thing I found buying used brass on-line - I ended up using some months later - primer pockets were very loose - either super crappy brass or the seller was not completely honest about that stuff being "once fired". Was tumbled and all polished up inside and out, but the fired primers were still in place. As a result, I seldom buy "once fired" commercial head stamped brass any more, unless it is ex-military with the crimped in primers, or from someone that I know and trust about these things. I have the tooling to swage out those crimps.
I own most all the toys for processing brass to re-load - I notice some sellers go through the commotion to tumble, shine up, de-prime and re-size - they say - in a effort to sell their brass - that might attract some buyers - but not desirable, at all, for me - I, personally, see little value to "pay" someone else to do something I can do here. The last batch of 6.5x55 Norma head stamp was in same condition as it was picked up on the firing range - dirty, with original Norma factory primers still in there. I do not doubt these were truly "once fired" brass, like mil-surp brass with the crimped in primers - unless I have been well and truly "hood winked".
Quantities might vary - uber expensive higher end stuff like Weatherby (Norma), Nosler, Lapua might come in individually segregated boxes or containers of 20 or so - sometimes more, sometimes fewer. Bulk Winchester (W-W), Remington (R-P) and Federal (FC) are commonly sold at retail in bags of 50 or 100 cases.
FC, in particular, had a line of ammo known as Federal Gold Medal Match - reputed among some to be very accurate target ammo - once fired, I know of no way to differentiate that brass from any other FC brass - although you will see ads where seller wants additional price because he says they are from FGMM ammo - I do not know how to verify that to be true, if it even matters.
Re-loaders are going to vary A LOT in their buying practices - some that I know might buy bullets in boxes of 100 (or partial boxes much less than that quantity) at a time, and brass in similar or less quantities and have 25 rounds of ammo last for several years - others will buy brass and bullets in quantities of 500 or 1000 per batch, or multiples of that, and use up much of it in a single season - brass cases normally lasting for at least 5 or 6 re-loadings - often much more than that, but some guys load very hot and get maybe three loads before the brass has loose primer pockets and is done. I have about average 300 empty cases for about 28 cartridge head stamps here (yes, close to 8,400 empty cases to re-load) - some will think that is uber, stupid too many and some will think is sort of a start - so a sale for 15 or 25 cases tends to not interest me too much, although that was how the stash was built up over the years - purchases were up to maybe 300 at a time, at most?
Quality very much changed over the years - for sure the W-W that I bought new, with blue labels on the bag, was very much different stuff than what comes today in the "new" red and black label bags - although both appear to have been and are now sold as "Winchester" brand. Your 30-06 cases head stamped by Imperial are likely much older than the ones stamped "FC", but is something maybe no longer known about them. My last purchases have been up to 300 x 30-06 - which fit into a Small Flat Rate Canada Post box, if loose or in plastic bags of 20 or 50 or 100.
There are three bags of brass here with label "RUAG USA" - two bags appear to be factory sealed - as near as I can determine the parent company "RUAG" is headquartered in Switzerland. The head stamps on the brass that are visible through the plastic is "MFS" - which is apparently a brass case maker in Hungary. So brands and head stamps may not stand for the same things that they used to stand for.
Is a humungous price difference among calibers - compare prices for 10 brass cases for .223 Remington versus 10 brass cases for 460 Weatherby - even if the same brand - and all strung out for the many dozens of cases in between, and different head stamps / brands. Like most used stuff - what you have is worth what someone else will pay for it - there is no "price list", that means anything.
