Hi there, @ifland. Let me help you find the Check you've printed in QuickBooks Online (QBO).
Once you print a Check, QuickBooks automatically logs this transaction in your Expenses menu. If you're unable to locate it, here's an easy method to help you find it:
For a simpler way to locate your Check:
- Click on the magnifying glass icon.
- Enter the Check number from the printed check and hit enter.

If the check still doesn't show up, try using the Filter feature in the Expenses menu:
Here's how:
- Navigate to the Expenses menu.
- Select Expenses.
- Click the All transactions then choose Check.

Additionally, I'll leave this article for your future use if you want to run the report for an uncleared check in QuickBooks Online: Run an uncleared check report in QuickBooks Online.
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Hit the Reply button if you need further assistance.