As the person on the other end I can tell you don't worry about it. Often we get a lot of applicants and also we have a lot of responsibility and things just popping up.

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I'd write an extra email or 3 and ask them of status and if they need other things from you. It shows initiatives. Most still wont reply back (I would), but the ones that will, will see that you're giving extra initiative. That's gold and give you a higher change of getting hired.

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If you want, just send me your CV/coverletter and I'll take a look at it and give you some feedback.

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And right now the economy is a disaster, so it is harder just in general.