I accidentally deleted folder from the trash can

Hi there, 

Welcome to Box Community and glad to help! 

Essentially, when Box purges your trashed content there is still a 14-day grace period for paying customers, during which Product Support can recover your content.  Beyond this 14-day grace period, however, files or folders purged from your Box trash may not be recoverable and may be lost forever. Please note that this recovery grace period does not apply to Free accounts. We are unable to support file recovery for our Free Individual plan. 

Thanks for posting!