For the source text click/tap here: Bava Kamma 65
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A thief pays the principal according to the value of the stolen article when he stole it, and he pays the twofold payment, fourfold, and fivefold payments according to the value of the stolen article when he is sued in court.
If, however, the stolen article is still in the thief's original state, he returns the article as is.
Shulchan Aruch discusses the liability of someone who stole property worth one zuz and by the time the thief was brought to Beis Din the item increased in value to four zuz. If the thief slaughtered, sold, broke, or lost the item at the time it was worth four zuz the thief will have to pay four zuz.
We explore the increase or decreased value of stolen property and how Jewish Law may have been influenced by the Sicarii robbers.