Hi makibear. Try posting this over in the Bird Watching forum. It's under the nature forums at the top of the page, just click forums.

Sounds like you really have some challenges. You have my sympathies! A tiny poked hole is more likely a house wren's thin sharp beak, sometimes taking them some distance away, or simply tossing them out. The house sparrow will toss the eggs out, but their finch-like beak would not as likely make a tiny poke hole. And the HOSP is more likely to stick around, harass, or even take over the cavity. "Do BB's destroy their own eggs" ... No "the nest possibly could have been flooded?" ... are there leaks that could be fixed? "Are the HOSP really sneaky" ... yes, but HOWR are sneakier ... "and resistant to the Sparrow Spooker?" ... yes, and house wrens will not be deterred by a sparrow spooker. House Wrens are even sneakier, faster and silent, leaving no evidence behind, only destroying eggs or young. You might hear them singing, but might never, ever see them! There are some links to sound files of house wren song and chatter on Bet's web pages, so you can learn to hear the unwelcome sounds of house wrens. Visit Bet's web page for more info. And by the way, the Carolina Wren is a very different bird, welcome almost anywhere; not a threat to other birds. BlueBars Here is a link that might be useful: http://www.sialis.org/index.html

My guess is they are cowbird eggs. Very gently remove the brown speckled eggs (as not to crack the bb eggs) they will hatch before the bluebird eggs do and will eventually take over the nest box and the baby blues probably will not survive. I get them in the poor chipping sparrows nest and the cowbird babies are bigger than the nest. The chipping sparrow eggs are thrown out of the nest by the baby cowbirds. Karen

It's illegal to move native bird nests, which probably includes incomplete nests.. According to Wikipedia : "Nests are made in cavities, including openings in buildings, hanging plants, and other cup-shaped outdoor decorations. " I honestly don't think they would mind that much, but it's best to keep your activity to a minimum once the eggs are layed/hatch.However, if it is really a bother, you should take it down..The female can built a new nest in 2 days anyway.. If you do let them nest,take it down once they fledge..This way, they don't reuse the nest..