Let me get this straight... And I'm assuming these are breeding age snakes of good health and pedigree...
1) Your 1.1 dumeril's boas were together around the 24th of December 2003. Where they separate prior to that date?
2) You did NOT witness copulation. Did you witness any courtship behavior? Did you check on them at all? When I put my 1.1 together I have a hard time giving them any privacy at all. I'm in there putting on the Barry White and lighting candles and stuff.
3) Two weeks later or 6 Jan., 2004 the 0.1 shed.
4) You didn't look closely, but you didn't notice swelling. I haven't noticed swelling in my 0.1 until a few months into it, and then I have chalked it up to wishful thinking a number of times. Usually, I give up hope right before babies drop.
5) Your question is: Is the shed breeding related? Or: Is this the right time?
Ok, here's what I think: Since you don't seem to keep a overly watchful eye on your snakes, then breeding MAY have occurred. A shed is common following fertilization (allowing for or induced by swelling), but not a determining factor. I assume that the 24th was the date they were introduced because otherwise that date is arbitrary. Based on my limitted experience, I would say that you have a 50/50 chance. Sorry, evidence is inconclusive to say otherwise.
My pair of Dumeril's were introduced on 8 Dec. and went right to it (all night). About three weeks later she shed, but a week later he did too (see how that is not a determining factor? He is definitely not gravid, but shed about the same time. Granted, he may have lost some weight with all of that activity...). Your intro timing seems right on, if a little late. Like I said, the next 8 months will be a roller coaster even with overwhelming evidence. Good luck,
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Zoodude
"Just because I'm paranoid, it doesn't mean they aren't after me."