A usable telescope is far more than the sum of two random lenses. It
requires a weaker positive lens as objective and a more powerful
negative lens as the eyepiece to obtain an "upright" image. Two
positive lenses make an inverted telescope image with lots of false
colour fringes. Though the image would be brighter and the field of
view wider than the later (opera/field glass) devices it would be most
unlikely to attract the delight of the inventor in most cases of
accidental holding of two random lenses within arm's length. Where
would these very special lenses come from in any useful quality? The
powers of the lenses have to be reasonable to avoid foolishly high
magnification or too little. I'd argue from the standpoint of having
made thousands of lenses that positive biconvex or plano-convex lenses
are very much easier to make than negative lenses using handcraft
skills of shaping a polishing clear materials. A biconvex is much
easier to make or procure in semi-finished natural form as solidified
bubbles, accidental glass from fire or found lenticular crystals.

Jewellery and the working of semi-precious stones may have a very long
history but the finished products were usually strongly convex and far
too valuable to be placed in any but the hands of the very wealthy.
After the inital examination of the jewels for clarity and quality
they would be worn rather than held up to the light in random pairs at
random distances from each other to achieve a nominal focus of the
pair at some random distance. Only much later when spectacles began to
become affordable and available would a random selection of positive
and negative lenses of various powers present themselves accidentally
to the curious child (no doubt despite the severest warnings) in some
anonymous optician's workshop. I wouldn't be at all surprised if
various inventive children were not thrashed for their curiosity and
the invention repeatedly lost to mankind. Had the all-powerful clergy
been asked to examine any new invention torture and murder is sure to
have followed swiftly to close any wormhole towards enlightenment,
education and progress. The final inventor no doubt tried on a pair of
spectacles with strongly negative lenses while holding up a positive
lens or even a another pair of positive prescription spectacles. It
may have been the chance occurrence of two customers requiring
completely opposite prescription simultaneously which finally lead to
the discovery of the "Galilean" telescope. It should not be
underestimated how difficult it really is to invent a useful telescope
even by complete chance.