You are not the only person this happened to. You are part of a number that runs into the tens of millions. There are roughly 45 million renter households in the United States. The single most common move-out experience for those households is some form of deposit dispute: a partial return with vague deductions, a return that arrives late, or no return at all. Studies that have tried to put a number on it consistently estimate that between 25% and 50% of tenants do not get back what they're owed when they move out. The dollar amounts are small enough that most people swallow them — and the entire industry is structured around that fact.
Here's the playbook landlords run, and it's so consistent across the country that it reads like training material: at the end of the lease, you get an itemized list. There's a "cleaning fee," typically $200–$500. There's a "paint touch-up" charge, with no receipt. There's a deduction for "carpet wear," even though the carpet was already worn when you moved in. There's a deduction for "repairs" with no description of what was repaired or by whom. The total deduction is suspiciously close to the deposit amount. The receipts the landlord is legally required to provide for most of these deductions are missing. The itemization is sometimes mailed late, sometimes mailed to the wrong address, sometimes never sent at all. When you call to ask, the landlord stops returning calls.
This isn't bad luck on your part. It is a business model. Landlords retain deposits because the math works for them: the typical tenant will not file in small claims for $800. They know it. They are counting on it. The deposit becomes, in effect, an extra month's rent that they bank against the chance that you will be too tired, too busy, too embarrassed, or too unsure of your rights to do anything about it.
The thing nobody tells tenants — the thing that flips the entire dynamic the moment you understand it — is this: state deposit laws are the most tenant-favorable consumer-protection statutes on the books in most states. Many states allow you to recover not just the deposit but two or three times the wrongfully withheld amount as statutory damages. Many states require landlords to pay your attorney's fees if you win. Many states deem any failure to send the itemization within the statutory window a forfeiture of all deductions — meaning the landlord owes you back the entire deposit, no matter what they claimed. A correctly written demand letter, sent by certified mail, citing the right statute, gets the deposit returned in the vast majority of cases without ever seeing the inside of a courtroom. Landlords know how the math works in court. They settle.