Media Labeling

I am recycling a bunch of once-used LTO 4 tapes.Up until now I have used exclusively new media, so I had BE set to do its automatic media labeling. I want to maintain the incrementing of media now that I am using the recycled. I see where I can rename and relabel media, but I have two questions:

1. Is it possible simply to "erase" the media label so that BE can continue with automatic labeling?
2. If not, wehn I manually relabel the media, if I continue incrementing from where the automatic BE labeling left off, will BE recognize this and, when it next needs to do an automatic labeling, take up where my manual labeling left off? Or will it just resume from where it last left off, whcih means I will have duplicate media labels.

Thanks in advance for your help.