Refrigerated Beef Brisket

I bought some prime trimmed beef brisket on March 9 with a sell by date of Mar. 12. It was kept in the frig in its foam/plastic wrap container until Mar.16. There was some odor when I opened it up and put it up to my nose. I washed it off and cut away some meat and scraped it off. Not much odor anymore. It had reached room temp for a short period of time before I did this and then I wrapped it and froze it.

Is it likely safe to eat? No children or immune compromised people will eat it and it will be thoroughly cooked first.