the following picture demonstrate exactly why i NEVER ship a card - even a 5 cent common - in a pwe....
first , as the item was found in my mail box today :

next , the envelope as seen from the front after removal from the usps damaged item baggy :

and finally from the back :

note the envelope is so severely shredded they had to put a rubber band around it to secure the contents....
this was actually a light-damage trade in which the card was described as having a tiny crease near the jersey window....thanks to the mail sorters there was a second crease there as well as a small gouged spot on the back....frankly i think i got very lucky at the minimal amount of extra damage done , but the condition of the package itself is clear evidence that rigid/thick envelopes should NEVER be sent as standard 1st class mail set to go through the sorting machines.....
first , as the item was found in my mail box today :

next , the envelope as seen from the front after removal from the usps damaged item baggy :

and finally from the back :

note the envelope is so severely shredded they had to put a rubber band around it to secure the contents....
this was actually a light-damage trade in which the card was described as having a tiny crease near the jersey window....thanks to the mail sorters there was a second crease there as well as a small gouged spot on the back....frankly i think i got very lucky at the minimal amount of extra damage done , but the condition of the package itself is clear evidence that rigid/thick envelopes should NEVER be sent as standard 1st class mail set to go through the sorting machines.....