Those bins aren't Midwest bins. M/F used cases with rectangle feet once they changed from metal to plastic. (I have both) In addition, the dividers between the bin levels are masonite (not plastic), and M/F printed their logo on the side of all their cases. I once had to replace a 30' wall of those bins, I know them well.
( sorry, I feel a bit odd arguing over the authenticity of hardware bins on a forum dedicated to arguing over the finer details of tools. OCD )
OBTW - nice grab on the bins. Like Jeff, I hope you grabbed enough cabinets to house them all.