I only want a fair and even exchange of mpusd to btc
You're in a tight situation there.
Moneypak can be intercepted online so easily and because of that so few around here on the forum would be willing to accept it without a receipt showing it was purchased with cash.
If you have a PayPal debit card, you can load it from your Moneypak, and then withdraw as cash back when using the card as a debit card or by using an ATM.
If you don't have a PayPal debit card, you can do the same thing by buying a prepaid debit card, register it and then load it using the Moneypak. From there, the options are mostly the same -- spend it, or cash back during a purchase. I'm not entirely sure if the card will let you withdraw cash at an ATM, or if you need to wait until the permanent card arrives. I've also read that you might not even need to register the debit card to load amounts under $500.
The fees in doing that are going to hurt though.
The best advice is to not mess with Moneypack as a method for buying bitcoins. For cashing out, sure -- they work great. But for buying, they are just as bad as any other reversible payment method thus few will trade bitcoins for them unless you have a good trust history - e.g., on the #bitcoin-otc Web of Trust (WoT).
One other approach is to use your Moneypak for a purchase.
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https://www.moneypak.com/WhoAccepts.aspxOne of the options is to purchase an Amazon gift card and use that for a purchase from Amazon:
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https://www.moneypak.com/Partner/Payment.aspx/AmazonGiftCard