BOSTON — When James (Whitey) Bulger and his girlfriend, Catherine Greig, were on the lam in Santa Monica, Calif., they befriended a stray cat, Tiger, feeding it and taking it to the veterinarian. But Tiger did not repay the kindness, leading, unwittingly, to the duo’s arrest in 2011 after a former neighbor, who knew them as the cat’s protectors, recognized them from F.B.I. photos and turned them in.

A framed picture of Tiger that hung on their wall was one of hundreds of items that were sold on Saturday at an auction of Mr. Bulger’s and Ms. Greig’s belongings. A friend of the Greig family bought it, along with several pictures of other cats, for $110, with the intention of giving them to Ms. Greig, 65, who is expected to finish serving 10 years in prison in 2020.

Mr. Bulger, 86, who is serving a life sentence, was one of this country’s most vicious and notorious crime bosses, and at one time ranked just below Osama bin Laden on the F.B.I.’s Most Wanted list. He was convicted in 2013 of a sweeping array of gangland crimes, including 11 murders.