mid 2012 macbook pro 13 logic board md101

Not to bash Apple Stores but they're busy places. You can find one using this link (click on the 'Service' block):

Since the genius bar proved to be of no help I would strongly recommend something called an Apple Authorized Service Provider for a second opinion. What leads me to believe this is 1) you've tested multiple sticks of RAM and the issue still occurs, 2) you believe it's happening after transport so things could be shaking loose temporarily, 3) the genius bar couldn't find an issue when running tests meaning maybe when they were testing it the weary solder points just happened to have settled and were making sufficient contact at the time. What you're describing to me sounds a lot like a possible solder point issue between the RAM slots and the logic board itself, unfortunately.

The problem is that most people assume that only the actual RAM itself can trigger the beeps when in fact there's a chance that it could be the RAM slots causing the issue. 3 beeps upon startup definitely signals a RAM issue.

Mid 2012 macbook pro 13 logic board md101