This is a question but i'll just give a backstory to make the events clear...

So in a nutshell, my mom travelled from Nassau to Lagos via Heathrow last October for a church seminar and her luggage was lost on the LHR-LOS leg of the trip. After three months of emails back and forth, BA has finally admitted they cant find the bag and sought out receipts for compensation. The problem now arises in that most of the items in the luggage were purchased on a trip to the U.S 3 days before the trip to Nigeria started. However as per our customs law, we are required to declare all goods bought and hand over our receipts upon arrival back into our home country. So I have literally only 2 receipts that she has left. This was during the ending of the Ebola heightened epidemic, so she purchased everything she needed from the trip in the U.S because she feared shopping in Nigeria. I know the Montreal convention applies but they are going to reduce it by 50% according to the email they sent me.

We're talking over $2500 worth of stuff and the most I might get maybe $700 or so out of the max possible $1693. I realize and understand why they require receipts but was hoping they also used logic in some cases. I've sent them pictures of the 2 receipts I have as well as one of the US stamp entry and returning stamp in her passport so they can see the dates, as well as a detailed explanation. My question is now, do I have any other actions I can take or is this pretty much a done deal.

Apologies for the long paragraphs.