Send in about 20 or so. Got back 3 envelopes so far. The first was empty but the envelope was intact. The second envelope was ripped in half down the middle and came without a GC in an official USPS package saying it was damaged in transit. The third arrived with a $10 GC but had a neat slice along the bottom edge and taped shut.
Maybe there's a VSSRP thief working in the local post office.