As far as i understand you are sending 2 packages to WES Canada. The first is a copy of your Degree and the second is the sealed transcripts. You could put these in 1 package but the sealed transcripts envelope will have to be included as is. Also remember to mention the Reference number clearly.
Offical WES Guide to Sending Transcripts
Degree Certificate - WES Does not mention that this has to be attested
Bachelor Degree, Master Degree, Postgraduate Diploma, Doctoral Degree. For completed study, send a clear and legible copy of this document to WES. Do not send your original document.
Annual Statement of Marks/Official Transcript - Has to be from the institution responsible for conducting the examinations
WES does not accept mark sheets that have been issued and/or attested by the college you attended unless from an autonomous or constituent college
How to seal Transcripts
If the institution gives you the document to send to WES, the document must be attested, dated, and placed in a sealed envelope that is signed or stamped across the back flap by the appropriate authentication officer at the institution that conducted the examination. If the envelope is opened or there is no stamp or signature across the back flap, WES cannot accept the document.
WES only accepts documents attested and sealed by the designated official at the institution that conducted the examination (e.g. Controller of Examination or Registrar’s Offices). Attestations by individual professors, officials at affiliated colleges, or external notary publics will not be accepted.