Sorry, no. Perhaps if the coins were rolled, but that might (would) force the payee to unroll the coins and count them. A few missing coins from even 10% of the rolls is a substantial sum.
I believe the law says an unreasonable amount of coins can be refused and certainly, the amount supposedly paid in coin is an unreasonable amount to be sure. I believe a merchant can refuse payment in coins as well; there is no law that forces me to accept payment in coin. No reason Apple has to either.
Until the coins are counted and the amount verified, SS is still on the hook. No debt was settled until the final count is in and it can take a long time to count that many coins.
I have never heard of any federal law that, without proper documentation, you can refuse a legal payment (even thought some payment methods seem unreasonable).
A future transaction (such as a retailer) can refuse a transaction for nearly any reason, including excessive coins.
If there is a federal law about court mandated lawsuit payment, please let me know. REMEMBER: cases such as divorce are a separate entity which CAN and WILL dictate payment methods.

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) for stealing their oxygen for some totally bogus and crazy insane foaming at the mouth claims.