When I said cash, I just simplify things. Actually first the thief deposits the check in his account, and then he will transfer the money electronically to a number of accounts, some are overseas, where the money will be cashed.
I am not a thief obviously but here are some schemes that the thieves use.
Most importantly, the trust and KCC are not going to re-issue another check for you, whether it is lost or stolen and cashed by somebody else. In fact they even wrote at their site that you will liable for tax even if your check is lost because the trust will report to the IRS that you received money.
If you have dealt with the IRS, you will know that they are worse than the Mafia.
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