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Thanks for the comments,everyone! Mark, thanks for the ID. It shouldn't have taken so long, I was just unsure about labeling it brunnea, in case there were others in Oregon. Apparently that's the most common NA species (maybe the only one), it's probably correct.
It looks like a 4th instar of Brochymena sp. which are commonly called rought stink bugs. I'm not sure what species it is. B. qudripustulata is common across the US, and I am currently rearing some that are in the 3rd instar. I'll let you know what the 4th look like (if they survive.) However, there are a lot of Brochymena species and the keys that are available, in my opinion, are a little unclear.