I don't know if he's messaged you or not (you might want to quote him so he gets notified)
Try using it in edgeville as whenever I've made my own scripts thats where it works best, dont try grand exchange as its too crowded and can cause hiccups.
Available banks/chest in SRL-6 off the top of my head you can try
1. Shanaty pass
2. Varrock banks (blue NPC)
3. Edgeville bank (blue NPC)
4. Lumbridge bankers/chest
Try those and see what results you get.

