Can you right click on the tpk, then click on 7 Zip > Open Archive. See if your folder has a servicedescriptions folder and open up the file inside of the folder.
You will see a section in the JSON that will look like this:
},
"minScale": 36111.909643,
"maxScale": 1128.497176,
"units": "esriMeters",
"supportedImageFormatTypes": "PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP",
"documentInfo": {
"Title": "",
"Author": "",
"Comments": "",
"Subject": "",
"Category": "",
"AntialiasingMode": "Best",
"TextAntialiasingMode": "Force",
"Keywords": ""
},
The bold text shows the min and max scale for the tpk. I generated a test case with just a tpk with data and was able to get dow to the 1128 level. If you are missing a file or if those numbers a 0'd then there could be an issue when the tpk is being generated.