The springs in the first photo are SMG C1 springs. They will only work with the Canadian one piece bolt of the Canadian model. As such, they are not in high demand since there are very few SMG C1s in civilian hands in this country. While the Canadian bolt and spring can also be used in the Sterling Police carbines (of which there are about 50 in country, and 3 for sale on the EE right now), the spring by itself would not command a great price. The cocking handles will fit either model. The springs and cocking handles would likely go for about $10 each, but you have to find the right buyer.
The FN stuff is not in particularly great demand on this side of the border, although there can be some demand stateside. List them on FAL files. This side of the border they are worth $10 per item, south side they might be worth $20.
The items in the bottom photo are the current issue handguards of the C7 rifle. Bring them back to the armoury. Otherwise, they will fit any 20" AR-15.