More rules for any donated fastener collections:
Any coffee cans of nails, nuts, bolts, or screws must also have sufficient dust and rust so that they fuse into a solid mass.
All items must have been used at least once, and be slightly bent or have the heads stripped.
It's preferred to have some small rusty tacks mixed in.
And, there can never be any more than one less of the quantity that you really, really need to finish a project.