Your $464 is sort of in the middle but it had disappeared by the time I looked on AmSnag. But while looking, I spotted a $520 Family Bedroom which is a good fit into the second-highest bucket but it went away after a few minutes. I've a feeling your $464 was a spasm in Arrow and you just happened to catch and book it! Here's why I think so: Arithmetic progressions based on known high and low bucket values for any sleeper are usually off by less than 1% of the known three central buckets. The $520 I spotted was only $2 off the estimated $522 value, or was only off by 0.4%. In contrast, your $464 was off the central (and closest) estimated value of $432 $430 by $32 $34 or was off by 7.4% 8% - that's why I'm thinking it was a spasm in Arrow.
But if nothing else, it was a lot better than all the $612 prices seen just now during my check of the CL in both directions for 11 months out. It was the only price seen except for the $251 (still there on 26 Nov) and the fleeting $520 offered sometime during May.
I wonder if anybody ever booked an Arrow spasm that was below the low bucket?