I'd go get a bottle and open it and take an SG reading first. That would be the perfect way to know if you've got bottle bombs or just overcarbonated beer.
While dumping them back into a carboy would oxidize the beer, it's definitely better than losing an eye or worse to a bottle blowing up when you go to open it. I'd gently pour them into a sanitized carboy without splashing, and stick an airlock on it and wait two-three weeks before bottling again.
If that's too much work, take one bottle and check the SG by pouring into a hydrometer test jar. Report back what the reading is and we can help you determine if you've got grenades or just a risk of overcarbing!
If I vent them now will the yest still eat the sugar if there is oxygen present? Or should I leave the caps on just to let the yest eat the sugar and produce carbonation then vent?
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