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Goto USPS.com and login. After you are logged into the site, visit this URL directly: https://missingmail.usps.com/#/
Using this method, I can get it to load every single time. When you click the link from the "missing mail and lost packages" page, the URL gets encoded with some sort of tracking tag which is what is causing the page to not load properly (potentially). When you use the link I provided, it bypasses that aspect. Definitely let me know if this works for you. Good luck.
EDIT: For those having issues. Do it on a computer browser, not a mobile/phone browser and this should still work.
EDIT 2: Since many of you don't want to spend time reading comments, and the 2nd method has been downvoted enough to be far down the page...
Alternatively, if this doesn't work, here is another method. You still must be logged in, then visit this link: https://missingmail.usps.com/#/history
Once on this page, click on the link that reads "New Search Request". This also works for me and is how I discovered the first method.
IF IT DOES NOT WORK ON THE FIRST TRY, KEEP TRYING. IT WILL WORK EVENTUALLY. COMMENTING "DOESN'T WORK" JUSTS SHOWS YOUR LACK OF PATIENCE... IT DOES INDEED WORK.
I had a fairly valuable priority mail flate rate bubble envelope shipped to me. The package was initially scanned in at a distribution center in NY. There were no updates for a week and I submitted a help request form.
USPS actually called me (which surprised me) and stated there has not been a physical scan for a while. She said I should file a "missing mail claim" and they she flagged the shipment. She continued that sometimes just flagging the package will have it moving again. I submitted the missing mail form last week, but there have not been any updates on it.
I have a small hobby business and ship USPS A LOT. I've had packages take a long time to be delivered, but I've never ran into a package having a single scan then never having an additional scan for multiple weeks. At this point, I'm wondering if I should keep patient or submit an insurance claim? There is insurance on the package, but the contents are sentimental as well as valuable and I'd rather have the package.
Has anyone submitted a Missing Mail Search with USPS and have it work? Additionally, if anyone has any input on filing an insurance claim, I'd be interested in that as well. Thanks!