[mothered]

157 Grams

With a little extra packing, you can box them.

Will I get billed and will the seller on ebay know?

I highly doubt It, but can't say for sure whether they'll notify the seller. If your SE has gone according to plan, there's no reason to debit your account.

Do note that the serial number Is unique to every cell phone (no two are alike) and as such, Its IMEI number can be Identified, hence the seller's device may be blacklisted. Personally, I wouldn't target Individual/personal sellers.