Hello 40URHEAD! Congratsulations on conquering the mountain of boxes! It's no small deed.

Linework

Wow your line work is impressive. It's very clean; I can tell you used the ghosting method for all your lines. Pleased to notice you hatched lines for most of the challenge. You started adding lineweight to your boxes around the 150th, and you did it well too: it's placed properly on the silhouette of your boxes. Good work all through.

Box Construction

I'm liking what I see here too. You drew boxes of many different orientations with varied foreshortening and you have understood that all your lines have to convergence, even if its ever so slightly. (save for the few orientations were they turn into 1-2 Point Perspectives. Good

There's a few times where your line extensions are missing (94, 140) and there's this one box where you.. didn't finish it apparently? (191) But except for those few occasions you did all well with extending your lines.

Conclusion

Overall your boxes came out great, you understood the purpose of this exercise very well, the execution is fantastic....