Am I justified in my frustration?

Hello. I need to clarify a few things.

As I said before I purchased a stash of parts from a friend of mine and this differential was one of the items. I had no prior knowledge of the condition of it. I purchased hundreds of parts that day and this diff was just one item. I saw it, installed the axle that was laying next to it into the housing, tapped it into place and loaded it up. It was not laying in a puddle of rain water and it was not even out in the open. It was under a car port. Most of you here know what a “rusty” , back east diff looks like……very heavily pitted on the outside, brake line tabs rusted off and all the third member mounting bolts frozen on. This diff is a topical California suspension part, no pitting, plenty of inspection marks still visible and no pitting. I had no reason to believe that this diff was not “rebuildable”, none what so ever. Yes I knew the pinion was stuck but I did not think it was a big deal on a low priced, rebuildable rear end. The Dana in my Barracuda was in much worse condition when I got it. Had it rebuilt. They changed the clutches, bearings and gears…….

I had no idea that this post even existed till after 8:00 pm Thursday night. I offered a refund at 12:00ish on Thursday, sent the refund within minutes. I was relieved that it was over. Started working on my car and was notified that this bitchfest was happening. Looked it up and could not believe what was being said. For $250 he got a ton of good parts. That diff is in very nice condition and in the right hands will end up back on the road again with no issues.