If you’ve used a quantity key or if you shift-right-click a drawer with an empty hand, you can see how many items there are in a drawer, but it doesn’t display the exact number—e.g., it says “32.4k” rather than “32069.”

Here’s a suggestion: Similar to Refined Storage, holding shift allows you to see the exact amount of items in a drawer when looking at it (if you’ve used the quantity key) or when shift-right-clicking on the drawer.

Does RS display it somewhere else? An item box will only hold about 5 digits at half size.