I've bought and sold too many 26" boxes. A top box like that will go for about $45 max, if it was in mint condition, had more drawers or was a better brand like SPG or Craftsman a top box can go for as much as $100.
The bottom box is worth maybe $90. A top of the line bottom box (that would be same caliber as the $100 top box) could bring $200.
All these prices would be fair for the buyer and seller, these aren't you **** deals! Truck brands could be worth a fair bit more too, although not many of the newer ones are 26". The Matco linked to in this post seems a tad pricey, but it is a truck brand and has tons of drawers, so it's not that crazy of an asking price