Deceased brother may have bought Bitcoin

My older brother passed suddenly in 2017. He was, to say the least, eccentric in every way. We did find receipts that he has bought platinum and gold, although we have never found any, physically. He was the kind of guy that would bury it in the backyard kind of thing. My husband and I were thinking that he might have bought bitcoin, it is totally something he would be interested in. Is there any way to find out? I’m not even sure we still have his laptop…I would have to ask my dad. Thanks in advance for any info!