If a package has been unsealed, for inspection or by accident, USPS will put a "seal" on it. Looks like a stamp. I have had this happen to a letter that was inadvertently not auto-forwarded to me and was opened by the new person at a previous residence. I know that part because they wrote an apology on the envelope.
I would expect something similar for an inspected package...
"Opened for Inspection." either on the seal or written on the package. If you don't see that you might want to inquire further to find out if your material wasn't worth stealing.
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