How to Tell if Invoices were in sandbox mode & a UI suggestion

Is there a way to tell if an invoice was from a test payment, especially PayPal Sandbox? I’m trying to work out if some payments were made via sandbox mode but don’t see anything obvious.

For instance, I have a recent invoice that says pending (I suspect this was done when PayPal sandbox was enabled), but I also have an pending invoice that I tested by stopping mid-payment on PayPal’s processor. Is there a tag or label for when an invoice records a sandbox payment?

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Additionally, there seems to be some confusion from users like me who enabled PayPal Sandbox settings, expecting this to be available on the test payments, but this seems to override regular PayPal payments. Correct?

Why do I suggest a change? Assuming I am right about it overriding the real PayPal payments, the label of the checkbox in the setting is quite vague and just asks if we want the sandbox option.

I assumed that ticking the box would enable sandbox for using test payments – when I pick to make a test. Maybe some wording to say “Override” or “This makes paypal transfers tests only” to convey how much it changes.

Something I would personally prefer but imagine isn’t of interest for the development is it to be not an “on-off” switch but a second section with sandbox details and a link somewhere on the registration page – or in the admin’s GD settings – for admin users to use the test payment.

Cheers.