Came across this looking for something else. Decided to look it up.
Hoshi brings a Borg-infected Phlox some food and critter snacks.
I’m not certain yet, but I think it’s the Glad Ovenware 8x8 Pans & Lids. It has the basic characteristics, including the 17 ridges on the side of the lid. It looks more square than rectangular, but it’s hard to tell. Importantly, it was available in 2002. Here’s a vintage product photo:
8 X 8: 3 Pans & Lids (56 OZ / 1.65 L)
They still make a 9x12 version but the 8x8 is apparently discontinued.
9 X 12: 2 Pans & Lids (96 OZ / 2.8 L)
I have no idea if the mold being used for this pan is unchanged from the time the episode was produced.
I don’t know if it appears in other episodes. I seem to remember some food containers in the Catwalk episode…but I haven’t checked yet.
So there. Your Holy Grail prop has been found!