They made it for a Tahoe. It was sealed at the beginning, but they changed their mind and decided to make it ported at the end. It has 1 port on each side.
Sounds lkke the shop doesnt know what there doing sealed and ported enclosures should be completely different sizes. Just adding ports to a box that was made to sealed specs will have wayyyyy to high of a tuning. Youd likely be better with literally just two in a proper ported box