Found A Bunch Of Coins Buried In Back Yard

Did you try the flame thrower on them? That should clean them up well.

If they were found in a garden, mystery solved. My wife said burying bronze cents in a garden changes the color of some types of flowers (like Hydrangeas) to blue and helps kill fungus that can hurt the plants.

It also probably makes it an EPA Superfund site, but we won't go there.

But OP says he had them tested and they were found to be Silver .

Hey John , If I were to bury all my copper and bronze Lincolns in the ground I bet I can change the color of all the flowers on my block .
@ fortcollins , not knocking what your wife claims .

Hydrangeas color is dependent on the ph of the soil. For instance, my plants can produce pink or blue flowers if you change the ph.

Did anyone else think the smallest coin in the group photo looked like a Lincoln Cent?

We haven;t seen any comments on the size of any of these items, which might help with ID.

Any ideas on what they are

As we said a month ago: they are not coins, and are not silver. Whatever you used to test them for silver content, was lying to you when it said they were silver. Silver does not look like this just by getting buried in the ground. Ancient Greek and Roman silver coins still look like uncorroded coins after being buried for 2000 years. Nor does silver look like this if it gets burned in a house fire.

They are either electrical box knock-out tabs, or some such similar round metal discs.