The question is why did Gibson get raided and not other manufacturers who use the same wood to build instruments?
The answer is found in the affidavit.
A shipment was seized for suspected violations of the Lacey Act. (paragraph 18).
The paperwork apparently did not even identify Gibson Guitars as the recipient (paragraph 20). After some investigation, it turns out the recipient was Gibson.
The paperwork listed the wrong destination (California, although the shipment was going to Nashville), and the wrong "HS" code describing the contents (paragraph 21).
So, after 5 minutes of research into the factual documentation that was provided several posts back, my incredible and admirable powers of reading English have revealed that:
Taylor, PRS, and other guitar companies were not raided because their shipments were not seized by CBP for suspected violations.
The first clue that Gibson's paperwork was incorrect could have been the fact that it listed a California destination, but was being shipped to Nashville.
Shipments to other companies were probably not seized because their paperwork appears correct, thus there is no reasonable suspicion of violations.
Let me summarize:
1) Import shipment has suspicious paperwork
2) Import shipment is seized for investigation because of suspicious paperwork
3) Investigation discovers substantial legal problems with the shipment
4) Somebody has been naughty
It's not difficult to read the affidavit.