Buying used snap-on box Vrs new bigger china box

My Snap-on roll-a-way boxes are 38 years old and are now worth more than what I paid for them. Lots of times the tool truck dealer will give you the price back that you paid if you want to trade in the future. And they come to you every week.
+1 4 years ago I traded in my Snap On box that I bought in 1984 and got what I paid for in towards this box. 7K used minus my $2500 trade in
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Start out with a nice big lower and can add top later. Personally I NEED THE WORK SPACE. By the way this box ways 900 lbs empty, not going to tip over.
Also he threw in the matching tool cart.