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@SusanY1 

Sorry for bugging you again. I should have realized that USPS actually has delivery services that has tracking like Priority Express which I think is enough to send such sensitive forms and I plan to use USPS Priority Express

 

in this case since it’s not a private delivery service, i believe I should send my 3520 to the PO Box  409101 in Ogden, UT 84409 like normal right?