Fantasy from start to finish The entire episode is based on a fetishicized idea of "noble thieves" that american police dramas are so fond of.
First, the jewels shown on the photos are worth A LOT more than the writers say. Someone mentions the thieves "got away with 250,000 dollars". Every single item Castle has on the photos is worth millions. Many millions.
Second, nobody keeps beautifications like that in a home safe, for that very reason - a home can be invaded, a home safe can be cracked, and all that value can be stolen. This kind of jewelery is insured "to replace" and insurance companies insist they are kept in bank vaults. Owners make legal copies and only wear those. There are a handful of events every year called "brilliant balls" where VERY rich people come to see and wear their jewelery for a couple of hours. The goodies are delivered by armored trucks and the whole thing is guarded so densely, the Secret Service gets green with envy.
Third, the "two minutes in and out", "disappearing like ghosts" and all that jazz hasn't been a fact of life since the invention of an electric alarm over 150 years ago. Bump keys are not "vulgar", they are useful and very quick tools. Thieves don't care if their method is "noble", they care about opening whatever they need to open.
This "oh in the olden times we used to be" fetish migrates from series to series with enviable consistency. Doesn't make any more true.