I Deposited $300 into my Teachers Federal Credit Union ATM w/o and envelope. Says I have a $300 Ledger?

I Deposited $300 into my Teachers Federal Credit Union ATM w/o and envelope. Says I have a $300 Ledger and that the money is not available. The bank ATM is 24-hr but the bank was closed because it is a Sunday. The bank is in Farmingville NY. Am I just out of this money now because i did not use an envelope??? or does the ATM maybe except the money w/o an envelope??? any info would greatly be appreciated as I am freaking out right now lol. Thanks in advance!!!