So you are pissed over:
1) $20 in wipers
2) $80 rear cargo cover (
jeep cherokee rear cargo cover | eBay)
Is it obvious \ intuitive that the rear cargo cover is missing anyway?
But you got:
1) $250 back
2) $1,000+ performance exhaust system which is obviously 50 state legal and any SRT-8 owner would trade their stock system plus cash in a heartbeat for
These things are known for temperamental TPMS sensors also.
I would say you fared OK, you need to chill.
Yasin