There was a body shop next door that was evicted by the landlord, and there were 6 toolboxes that had to be moved. A Snap-on KRL1032 stack, Matco 4s hutch and roller and four Canadian Tire/Sears value brand boxes. All of these boxes are loaded to the brim and had to be moved from that unit into ours for storage.
The value brand boxes had no problem rolling on concrete but as soon as the casters touches the asphalt the boxes were very difficult to maneuver. Two of the four boxes had their casters bent and/or collapsed from going up a small 1/2" bump (the asphalt/concrete crack) into our unit. That's just once over, imagine that you gotta move your box out of the hangar every day, are you going to remove all your drawers just to get the box back into the hangar?
I guesstimate that the Snap-on and Matco were twice as heavy but they were a lot easier to maneuver on both concrete and asphalt.
You get what you pay for. Just because your box sat in the same garage for 50 years doesn't mean they can stand the rigorous abuse of a professional environment.
Snap-on offers free drawer slides, locks, latches and caster replacements for life. From what I understand, the Waterloo and International replacements aren't.
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The value line boxes probably cost 1/10th of the others, so for that price, sure, I'd expect all that free stuff too! In fact, throw in some wax, a cover and warranty the paint too! I've changed ONE slide on my Craftsman boxes, and it was me being particular about it having a little crease. For 99% of us, it would be fine. I even saved it.
The Sears boxes of 50 years ago aren't the "value boxes" you're talking about and the Canadian versions may be a different vendor than the US sold Waterloos.
I have one of those "value line" Sears boxes in my garage. It's used for storing my NOS Pontiac parts. I have Husky, Kennedy and Craftsman boxes, and a Snap On side hanger from 1955 that was given to me by a friend.
I'd bargain to say both of my Sears Craftsman boxes were used in shop settings over the years as both looked pretty rough when I got them, but held up well. No broken parts or bent anything. Very thick and well made.
You can see one of them at my "Curbside Garage" post.