After 5-months inside a typical house, the boards have dried out and other than the fastener issue, probably won't be an issue. It becomes a big problem if they are enclosed so they can't dry out, or if they repeatedly get wet then dry out. Hopefully, yours should stay dry. If you do choose to use pressure treated, look for KDAT, kiln dried after treatment. Those should be as stable as "normal" studs.
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Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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