Mega Bloks kits from 2003. Both with minor issues

Blok Bots WARP (the bigger box) is complete as a build to make the Blok Bot but the elastic sling shot is missing (part #AM02547). As you can see from the photos, it is for shooting slime…which I would rather the kids not do anyways. It originally came with two barrels of slime but one has been used. The other is included-still sealed but I suspect that it has dried out since 2003. Kids never finished this build so some parts are still sealed. (They got distracted by the stupid slime!). Comes with instruction booklet. Two stock photos from the internet are to show front and back of WARP when finished. Gyro Racers SLINGSHOT (the smaller box) is being thrown in as a bonus when purchasing the other one. This comes with an instruction poster but no parts list. So I can’t check if it is complete or not. Says 50 pieces and I count 52. So this might be fine or maybe not. The boxes are included but both show shelf wear. Asking $15.00 for both.