When you go in to speak to your manager, there are a few talking points that you can use to your advantage so you can bring this little guy home. Your biggest tool is going to be able to explain that a "seemingly" aggressive snake is going to make potential owners uncomfortable about getting a snake at all. After all, who wants to own a snake if one snaps at the mere passing of a customer? Make it about the dollar signs and potential loss of revenue. It's hard to sell a $200 snake kit when the snake scares people. Use your knowledge about the BP too, and present the position that you will be able to rehab him and give him a good life.

Hope you are able to work it out.

Dave