Is it correct?

This is over 2 weeks now from the date I posted the packed and you're sending me a message the package hasn't arrived?

It zamiast this
Since zamiast from
package

i będzie zrozumiałe

Zrozumiale ale ja bym dal present perfect. 'now' bym ominal.

It's been 2 weeks since I *sent* the package and you're sending me a message now that it hasn't arrived yet?

Tak brzmi najbardziej naturalnie

Ja zrobilabym to inaczej:
It's been 2 weeks since I sent the package and NOW (today) you're sending me a message (now) that it hasn't arrived yet?