The very bawdy version "THE TRAVELER" in Rugby Songs (recapitulated in The Hash Hymnal) has six verses and but the time you've (or, at least, I've,) sung six your audience wouldn't want any more. It has a very interesting aspect in that the husband is also unfaithful. But still a drunken fool.

Child's 'A' version is, I believe, the first ever collected - and my favorite (MacColl is the only I've heard sing it - with spoken dialog in the refrain) also has six verses. The 'B' version has a full seven.

I wouldn't make too much of this. As said above there are many versions and countless things he sees in the house. There are never any "missing" verses, just different versions. I've heard excellent versions with only three nights.

I think this is one of the very rare Child ballads that developed a blues version. At least I can't think of any others.