In the event of fire, those thin rusted blades will probably be gone.
My dad in our old family home kept coins in the wall, same idea, a slot and drop a new or old coin and someday maybe recover them. Well the house burnt. He had a couple areas between the studs with coins, became a huge glob of metal and coins sticking out all over. Insurance would only pay $50.00 per glob. I used to do this until this happened.
God and family, the rest is icing on the cake.
I'm so far behind, I think I'm in first place.
Premier Bovine Scatologist
Host of the 2015 FAMILY WOODWORKING GATHERING