The NGC Guarantee does not apply to Coins that have been removed from their NGC holder, or if the NGC holder containing a Coin has been damaged, unsealed, tampered with or altered.

若封套被移除，被损坏，被解封，被篡改或被改变，则NGC保证将不适用此类硬币。

youdao

Widespread dollar coin usage could actually help with an ongoing industry problem, the inability of these machines to read damaged dollar bills.

FORBES: GAO Proposed Ditching Dollar Bill in Favor of Coin