That's some very enthusiastic rounding you're doing there, just to account for a spell (especially since its exorcism, the most common weapon spell).

The FaN resold to a bot, meaning it was definitely not valued over 10 keys. In general, it just seems like all the items he received were considered a pure constitute, as the view too was resold for pure directly after - this says something about their expectations in pure (which based on his reselling is closer to 75 than 85 actually).

It may be worth doublechecking if the seller there had a buyout, but even if he didn't, that sale shouldn't be rounded up to 85 for sure.