My father's SIM went missing at a phone repair shop any potential scam?

My father recently went to a local repair shop to get his phone battery replaced.

While one of the employees was opening the phone, he casually placed the SIM between the phone's panel and the case. Another employee then did the actual battery replacement. When the phone was being put back together, they realised the SIM was missing.

They searched around the shop but couldn't find it. Later, the same guy who had been working on the phone went outside to throw the garbage he collected in this and went toward a dustbin about 10-20 metres from the shop to throw some garbage, and apparently found the SIM there. He said it may have fallen out while they were working on the phone. My father didn't actually see him pick it up.

There hasn't been any suspicious transaction or anything else so far. I also checked call forwarding and SMS forwarding, and neither appears to be enabled.

Is there any potential scam or security issue that could happen later because someone had physical access to the SIM? What should I look out for, and is there anything else I should check now?