Okay let me see ...

1) Did BSW in fact agree to the return and give you a RMA knowing ahead of time it would not come in or with the original boxes?

If so, score one for you because they accepted a situation that's not their store policy. If not, unfortunately, then you dont have much of a case. The actual cost of the original packaging is not relevant. The amount to be deducted or even consider refunding is all BSW's option. Unfortunately, this is standard practice here(doesn't matter if this is fair or not).

2) If you asked them for pics of damages and they have not responded yet - I'd wait a bit more considering the holidays. Keep sending them emails just in case they didn't get them - just be polite. After about a week or two more and still no response - score one for you. That would be unacceptable to me. Don't know the situation on their end but you have been trying to contact them and even posting here. They should definitely try to help you in filing a claim.

Bottom line:
I understand that you are willing to take a cut but you feel the amount is not fair. However, in general , the decision and amounts on compensation/refunds etc are usually in the company hands - not yours.

However, companies should definitely assist people in filing shipping damage claims and also respond to communications - especially to customers.

Hope you get things resolved ... Good Luck!