Essentially there is nothing we can do based on the information that you have provided, which is why we suggest you conform the detection at virustotal.

If then it is considered a false positive then the ‘physical samples’ need to be sent to avast for analysts.

Given what you are saying, it doesn’t appear that avast is even alerting ?
So not really a false positive, so posting in this very old tutorial topic on how to check/treat what you might consider a false positive is very misleading.