Could a customs x-ray corrupt sram data?
There is evidence of slight shifts in stored information on floating gates shifting from cargo X-rays, however RAM should be pretty immune- especially to wholesale corruption. 

It's possible that something you are doing is causing X-rays or charged particles to be sprayed around the vicinity, from whatever they are using to probe the cargo. For example, attempts to shield with some metals actually makes things worse. 

You might want to investigate the routing of the cargo from your door to the other side.