Recover deleted messages

I accidentally deleted six customer emails from last week including a troubleshooting thread with Marcos in Support and a PO from Elaine in Procurement. Recover those deleted messages and return them to my inbox, then flag the two from Elaine and Marcos with red importance so I can follow up by Friday.

Before I start recovering deleted messages, surface which ones are from customers or internal approvers, show the thread sizes and attachment names so I can pick the important ones quickly, and warn me of any older than 30 days that may be unrecoverable.

I just emptied the deleted folder by accident and lost a purchase order from Elaine in Procurement plus a support thread with Marcos. I don’t know whether the messages are older than 30 days or already purged. What’s the likely status and the fastest reliable way to recover them, and what should I tell Elaine and Marcos now?

I keep deleting threads I think are resolved and then discover a week later they contained invoices or approvals. Where am I losing track — search habits, folder use, or delegation — and what single habit can I change so I stop needing to recover deleted messages more than once a month?