 However, also this quite reasonable conclusion has been questioned and it has been claimed (Lewis 1997), that the very existence of the tails implies that the enumeration principle (i.e., the fact that the claim ‘particle 1 is within this box &amp; particle 2 is within this box &amp; … &amp; particle \(n\) is within this box &amp; no other particle is within this box’ implies the claim ‘there are \(n\) particles within this box’) does not hold, if one takes seriously the mass density interpretation of collapse theories. This paper has given rise to a long debate which would be inappropriate to reproduce here. 