x4 MRE's 1985 Beef & Gravy! Selling

[justacoolchick]

Hey Folks,
Newbie here! And a girl at that...
The last thing I want to is to receive your coveted 'eBay Asshat of the Month' award - so I've come straight to the source.

My mother has these four old packs in her collection and asked me to sell them for her.
Three unopened. One has very old tape at the bottom flap - technically the box had been opened. The contents all feel the same.

I know nothing. Obviously. Please enlighten me; What's the best price I can expect to get for Mom, and are there any takers right here?

All are 53602G31 Beef, Diced, with Gravy.
housil was kind enough to tell me these are -- 1985 (Menu #8), Dec26s.

What do you need to know? The boxes are sturdy. No water damage. The contents feel... like there's a package of liquidy stuff in a bag inside. All four are stamped .69 cents on the side. My mother is a gem of a woman.. and they've been in dark dry storage in her kitchen pantry for years. She cannot recall where or when she got them. She left the army around '77, shortly after I was spawned, so all I know is that they weren't originally hers.

Thanks for your help, KA