Either constitution is not identity or the Necessity of Identity (NI) is false

Suppose that on day 1 Jones purchases a piece of clay \(c\) and fashions it into a statue \(s_1.\) On day 2, Jones destroys \(s_1\), but not \(c\), by squeezing \(s_1\) into a ball and fashions a new statue \(s_2\) out of \(c\). On day 3, Jones removes a part of \(s_2\), discards it, and replaces it using a new piece of clay, thereby destroying \(c\) and replacing it by a new piece of clay, \(c'\). Presumably, \(s_2\) survives this change. Now what is the relationship between the pieces of clay