OP, I've got an answer from Razer. As they valued [your] sensitive data so much, they can't post it here or relied the TX ID to me through PM. They are more than happy to provide it to you privately if you asked them. Can you send them an email or chat their live support and inquiring this? Please let me know if you've try and if you find any difficulties.
Once again thanks for all your help, despite all this, Rollbit Support still doesn’t want to provide me any proof of the returned deposit .
Latest support chat: https://imgur.com/a/vHHkS5w
Unfortunately, there isn't much that I can do. Rollbit take their customers' privacy very seriously, and on this case they can't provide the txID publicly, or even through me. One that I can suggest [risking Razer being very pissed at me because I kept poking him, LOL] is to perhaps write an email to their support, with a screenshot of Razer's post regarding returning deposit, and then tell me the subject of your email [making it unique and forum-specific will be a good idea], I'll send Razer a PM, informing him about your email and its subject, and he'll hopefully willing to track down that email and reply to you personally with the txID.