OLE-object will not display when opening an .ODT file.

.odt is an 'Open Document formaT' file. Word 2010 for Windows supports this format but in their infinite stupidity do not support this in Word for Mac even Word in Office 2016 for Mac does not support this format. OLE stands for Object Linking and Embedding and was a way of embedding one document inside another and I believe was originally devised by Microsoft. A typical example of where it will not work on a Mac is when a Visio or Project document is embedded inside a Word document as even though obviously a Mac can read Microsoft Word files it cannot read Microsoft Visio or Project files. In theory an embedded Excel, Word, or standard graphics file e.g. jpg, png, etc. should be displayed on a Mac.

I am not aware of a means of determining what the embedded object might be.

You could try various other programs that support this format e.g. Google Docs and OpenOffice and see if they do any better job at converting it.

If you can find another copy of the logo you could replace the embedded object.