No. As far as the CFC is concerned, there is more to being a collector than owning ten guns.
You aren't a collector unless you tell them you want to be classed as a collector and you complete the necessary paperwork and persuade them that you are collecting. Regardless of how many or how few you own.
If you are classed as a collector you are required to allow inspection of your secure storage if the authorities request it, within a reasonable time. If a collector fails to comply that alone can be grounds for a warrant to be issued for the inspection without his/her co-operation. If you are classed as a collector, even if you own only one gun, this regulation about inspection applies to you.
If you are not officially registered as a collector, and you own fewer than ten guns, you are not required to allow such an inspection just because they ask for it. If they do and you refuse, a warrant will not be issued for the sole reason that you refused the request. They have to come up with other reasons to persuade a judge to issue a warrant for a non-collector with fewer than ten guns registered.
If you are not a collector and you own ten guns or more, refusing to allow an inspection within a reasonable time is grounds for a warrant to be issued without any other reason, just as it is for a collector but it doesn't change your classification with the CFC to that of a collector.