Hi Louise. I'm another who's never heard of Buisson. Do you know how old the instrument is?
I was quite intrigued, so I went on an internet hunt - which I imagine you have already done.
I was a bit worried that you might have some awful Chinese oboe imitation, rather like those Chinese factory-made violins with Italian-sounding names. It's hard to find a decent resin oboe but for student models a decent resin can be better than a bad wooden one.
There's not much out there but I found this discussion over on the Oboe BBoard. This is a US-run discussion forum which quite often has some helpful discussions.
I also found this site (a clarinet site, you will note! ), which I thought had some useful insights. They list Buisson as a "fake" French brand name. I was particularly worried by references to Buisson that came up in a Google search with references to Dallas, London. Another comes up with "La Couture" mentioned as the place of origin for Buisson instruments. That would tie in with what the site says about instruments made by makers who were moonlighting from established manufactures in the "La Couture" district around WWII. There don't seem to be any new Buissons about, so this could be a viable explanation. In that case, who knows how good or bad it is. Maybe you got an excellent moonlighting oboe maker? Like other woodwind instruments, the oboe doesn't tend to improve with age but there are people who play on perfectly OK old instruments. Maybe that's what you've got.
By the way, older oboes often had more open holes. What does yours look like? Maybe you could post a photo...
It will be interesting to hear what your teacher makes of it. Have fun tomorrow.