CLEAN : Ten sculptures by Dali nabbed in Stockholm break in

A man describes a theft incident where ten Salvador Dali sculptures were stolen. The sculptures are valued between €20,000 to €50,000 each. Fortunately, the thieves did not take the certificates, which are crucial for selling the sculptures legally. This oversight could pose significant challenges for the thieves in selling the stolen art.

What is the estimated value range of each sculpture?

Why is the absence of certificates considered beneficial for the thieves?