Yes, @Finaco, I can provide you with a detailed, step-by-step guide to help you carry out the task recommended by my colleague in resolving your unrecorded deposits in QuickBooks Desktop (QBDT).

First, manually compare your real-life bank statements to QuickBooks for the period before 2023. Look for any missing deposits or transactions that are not recorded in QuickBooks. If you find any missing deposits or transactions, you can record them. Here's how:
 

1. Open your QBDT and go to the Banking menu
2. Select Make Deposits.
3. Enter the missing deposits and save the transactions.
   
   

Aside from that, you can also generate a journal entry to record them in QuickBooks. To do this, go to the Company menu, click Make General Journal Entries, and enter the necessary details for the missing deposits or transactions. Select Save & Close when you're done.

Once you have recorded all the missing deposits or transactions, you can proceed to do a mini reconciliation with your bank statements. Here's how:

1. Go to the Banking menu, then Reconcile.
2. Select the bank account with the transactions you need to reconcile.
3. From the Date of Statement field, enter the date for an "off-cycle reconciliation." This date can be any date between your last reconciliation and the next scheduled one.
4. In the Ending Balance field, enter the balance of your last successful reconciliation. Then click Continue.
   
   
5. In the Reconcile window, check off the transactions you are fixing and re-reconciling.
6. Make sure the Difference field shows $0.00.
7. When everything looks good, select Reconcile Now.

After reconciling the transactions before 2023, you can close the statements for that period and focus on reconciling your 2023 bank statements. It's recommended to reconcile your accounts in QuickBooks every month to ensure they match your real-life bank statements. 

If you experience any difficulties after reconciling or find discrepancies between the transactions in QuickBooks and those on your bank statements, you can find solutions to these issues in the following article: Fix issues when you're reconciling in QuickBooks Desktop.

Should you require additional assistance with any of these steps or have other concerns reconciling your accounts, leave a comment below and I'll get back right away.