There is the arguement that tumbling them may break the powder down which will make it burn much faster and create a high pressure danger.
If there isn't a lot of them you could clean them up some by hand. Or, just shoot them as is, I doubt the Mosin will have issues with them.
Could be interesting to pull one, keep that powder as a control sample and then tumble a few and check the powder in them to see if it has changed much. If there is no change then go ahead and shoot. I think if you didn't tumble them for days you'll be fine.
Of course, pulling them is the safest route and could give you non-corrosive reloads which is nice to have on hand.