I'm pretty sure it's the only pressing plant for video in North America - Technicolor in Mexico
https://www.technicolor.com/distribute/supply-chain-solutions/manufacturing
I take it The Office sets are reissues of the previous single season sets sans DVDs and expired digital codes and in a proper (Ie not digipak) blu-ray cases. Season 9 was at Big Lots! for $8. I picked up some of the other season a few years back at Fry's Electronics for under $4.00.
Season one is on VUDU OAR and the wal*mart widescreen LiS DVD set has a code that includes season 1 and a special feature a ComicCon panel discussion with the surviving principal (save June Lockhart) cast members - My Sony 4K showed the stream as 1080p I didn't check the prices on the other seasons