Full Idea
Quine notoriously demands identity and individuation-conditions for mere possibilia.
Clarification
'possibilia' are possible objects
Gist of Idea
Quine wants identity and individuation-conditions for possibilia
Source
report of Willard Quine (works [1961]) by William Lycan - The Trouble with Possible Worlds 01
Book Reference
'The Possible and the Actual', ed/tr. Loux,Michael J. [Cornell 1979], p.277
A Reaction
Demanding individuation before speaking of anything strikes me as dubious. 'Whoever did this should own up'. 'There must be something we can do'. Obviously you need some idea of what you are talking about - but not much.