Done this before... bought helmet in phuket n was planning on wearing it to pass customs...but midway changed plans n wear back my hjc. Put new helmet in top box.

Pass customs easily coz they didnt stop or check us at all.

But..that may be different now after the case of a group of thai big bikers carrying drugs in their boxes got caught in chiang rai. Someone in the versys group claims he got stopped n checked at betong border a few days ago.

https://www.77kaoded.com/news/big/2539188