How to tell if bootloader is unlocked on GSM Play

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http://forum.xda-developers.com – I'm looking at buying an Xperia Play on ebay, and I'm trying to find out if the bootloader is unlocked. The seller says it is sim unlocked, but he doesn't speak good English and isn't understanding that I am asking about the bootloader. On my Nexus phone, there's a little padlock on the screen that shows what the unlock state is...does Xperia Play have something similar? Or is there a command I can ask the seller to run to tell me if it is unlocked or not? He just keeps telling me it will work with any GSM carrier. (HowTos)