I actually know what those are!
I'll be damned. - there are also two thick pieces of wood with a bunch of holes in them that might be part number 6. There is a bunk bed upstairs - it's metal and it's ugly but it's also solid and heavy and not all that old. You might want to check Habit for Humanity also - they get bunks on occasion and print pictures on their facebook page. https://www.facebook.com/paxrestoreI actually know what those are!
Did you have any bunk beds, or any cheap kids' beds?
So, those are slats that go between edges of the bed frame to support the mattress. You see the string? that's to hold them together when they are shipped. The holes on the ends are where screws hold these slats to the bed frame.
Usually those are cheap wood (the one I put together several years ago are cut plywood), so almost zero value.
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\Found this: View attachment 149259
It's an eagle, talons extended, pretty certain it's bronze, pretty heavy. Personally I think it's hideous but I can imagine it on someone who is not me's bookshelf, if someone would like to give it a home before I take it to the dump. Honest to God I picked it up and thought it would make a great murder weapon.
These are bed slats for an IKEA bed