Yourrid
(Yourrid)
3
Call the 1800 number for USPS and ask to initiate a trace. I’ve had to do it before and they usually figure out where it got lost. Granted I think you have to wait 1 or 2 weeks after the proposed delivery date for it to begin tracing.
On another note, cashier check through the mail seems awfully risky. $11 to send thousands and thousands of dollars that are cashable by anyone seems risky to me. Pretty sure this is why Western Union is still around today.
Good luck!