Gaius listened to the exchange, not wanting to get in the middle of Regulus and his new employee. He was very pleased that Regulus had remembered to introduce him as Snape instead of Blank, even though he'd gotten a few rather narrow-eyed looks from some other people when using his new name.
"Regulus has some fascinating items," Gaius chimed in, tilting his head toward the sarcophagus. "Hopefully you don't spook easily - some of these things are a little unnerving until you get used to them."