I was on a Normal Mode LM run, after WEP story mission, with Drs. Orders and Animal Rights active, and Rakkaholics awaiting turn in. I loaded the game in the Slaughter Dome, and entered WEP through there. I checked the Dr. Zed vendor, then walked to the small room with 2 Stalker “uvulae” hanging from the ceiling and a yellow Hyperion Weapons Chest and killed the EXP loader here. Then I went back to the building exit and scoped the area for Pimon and Tuumba (they were not there). I came back inside and began opening containers. When I opened the one caddy-corner to the Vendor machines, below the skags, a musical note played. Very apparent, not muted as though it was meant for something else.
Additionally it was a very successful run, as there were 8 LMs (including the 4 in the boxes) between Slaughter Dome and Son of Mothrakk. Although no Legendaries were to be had.
GOTY (all DLCs and Season Pass)
Had a Salvador Mule
Previously I had Assembled the teddy bear twice