Thanks for the response. I just read it after returning from the garage for one last examination before "not being able to sleep all night because it's bugging me." I actually figured it out, finally.
On my box, the guide that the bottom 'garage door' rides in MOVES a little to engage &...
I have Montgomery Ward Powr Kraft two piece rolling chest toolbox (at least 60 yrs old).
Installing new casters on the bottom (rolling) piece, I turned the chest upside down. Now the drawers are all locked and I can't figure out how to unlock them.
Any help would be appreciated.