- Buy expensive items up to the 10M range. Ex: Gbomb, Krawk MP's, Other BD Weapons etc. Neofriend your main account and send it as a neofriend. You want to send items that high, because you don't want to be sending 101231243 items that are worth around the 500k range. Supposedly after sending a certain amount from one account to another you get flagged.
- Go through trades. Put an item up for trades and make an offer on your main and accept the trade.
- "Misprice" an item in the shells shop and "snipe" it with your main
- Other advice: Make sure your main isn't on the same proxy as the shell account, send neomails from your shell to your main once in a while, make it look like they're different people and make it seem like they're friends
If you have more to add post them in here and I will update this post!